That's fine, there's already an API for this: https://developer.mozilla.org/en-US/docs/Web/API/Window/beforeunload_event https://developer.mozilla.org/en-US/doc

That's fine, there's already an API for this: https://developer.mozilla.org/en-US/docs/Web/API/Window/beforeunload_event https://developer.mozilla.org/en-US/docs/Web/API/Window/befo... That's very different to sites like tomshardware that pops up a "hey why don't you check out this extra slop you didn't ask for" when you try to navigate away